System wait for a connection before start my application

I had write a custom application in C language to control a inkjet printer; this software works on this hardware:
1) Motherboard Avalue EPI-LX800 (Geode processor)
2) Custom PCI board to interface Motherboard with printer head
We have build a custom distro with Pengutronix application.

The printer work fine but we have the following problem:

1) At the end of system boot, our application in launch automatically

2) During this phase, if we haven't a network connection attached, or we have a network connection to a PC via crosscable, the system goes in a wait state. A simple plug/unplug of the network cable, or attaching a mouse or keyboard (PS2 or USB), awake system from wait state and system complete start correctly.
If the system have a network connection attached to a switch / hub of a domain with DNS server the system doesn't go on wait state and application start correctly without the need of plug/unplug network cable.

I don't understand which is the item that system wait for whe it is on "wait state previously described". Can someone help me to find problem ?

Thanks in advance.

What network service do you turn on, such as NFS client?

Network services:
ssh
ftp
telnet

During other test, the system freeze also if we have a keyboard plugged before booting; to unfreeze system we need to press a key during freez state.

Maybe sounds strange but have you checked the BIOS settings

Report mode on keyboard ore mouse present ?

Ore
what do the
#tail var/log/messages
give

On embedded system we have BusyBox without tail command.

During other test we have seen this behaviour:

1) using a 1GB PQI Industrial Compact Flash the system has no problem

2) using a 1GB INNODISK ICF4000 Industrial Compact Flash the system has problem as described previously.

Thanks

What's the process or module when system is waiting in there? In other words, what's the display on console when system is in waiting state?

The system wait for login, but it goes on this wait state when start my application (automatically with a script place on /etc/init.d and it's link place on /etc/rc.d).

If we start our application with strace (on script we have this line:
strace /usr/bin/our_application) to trace all system call, the system start without any wait condition.

Thanks